Okay guys, so this is the situation, I have Dragon Queen of Tragic Endings on my field before, and it has been sent to the graveyard as a result of battle or effect. In a future standby phase, I send a continuous spell card from my back row to the graveyard to SP. it from the graveyard, however, my opponent negates its summoning through the use of Royal Oppression/Solemn Warning/Solemn Judgment and it goes back to the graveyard, it's still in the standby phase, can I activate it's effect to send another continuous spell card from the field to the graveyard to SP. it again? Also, if I don't have more than 3 continuous spell cards when I'm attempting to SP. it back during a standby phase, can it still be SP.ed? Lastly, under the TCG rulings of the card, it says that sending a continuous spell card to the graveyard is a cost, but it doesn't state anything in the OCG, following the OCG rules here in Singapore, is it still a cost or no?

This is the link to the card: http://yugioh.wikia.com/wiki/Dragon_Queen_of_Tragic_Endings

It's effect is this :"This card cannot be Normal Summoned or Set. This card can only be Special Summoned by controlling 3 or more face-up Continuous Spell Cards. When this attacking card inflicts Battle Damage to your opponent, your opponent selects and sends 1 card from their hand to the Graveyard, and you draw 1 card. During your Standby Phase, if this card is in your Graveyard and was sent there from the field, you can send 1 face-up Continuous Spell Card you control to the Graveyard to Special Summon this card from the Graveyard."

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